CN1470072A - LED module - Google Patents

LED module Download PDF

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Publication number
CN1470072A
CN1470072A CNA018174647A CN01817464A CN1470072A CN 1470072 A CN1470072 A CN 1470072A CN A018174647 A CNA018174647 A CN A018174647A CN 01817464 A CN01817464 A CN 01817464A CN 1470072 A CN1470072 A CN 1470072A
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China
Prior art keywords
led module
led
carrier
semiconductor body
module
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Granted
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CNA018174647A
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Chinese (zh)
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CN100431161C (en
Inventor
Wϣ
W·马希尔
W·施佩斯
ض�
G·怀特尔
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Ams Osram International GmbH
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Osram Opto Semiconductors GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321—Disposition
    • H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/73—Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01019—Potassium [K]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01068—Erbium [Er]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/12—Passive devices, e.g. 2 terminal devices
    • H01L2924/1204—Optical Diode
    • H01L2924/12041—LED
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Led Device Packages (AREA)

Abstract

An LED module has a carrier, which contains a semiconductor layer and has a planar main area, on which LED semiconductor bodies are applied. Use is preferably made of LED semiconductor bodies which emit light of differing central wavelengths during operation, so that the LED module is suitable for generating mixed-color light, and in particular for generating white light.

Description

Light-emitting diode (LED) module
The present invention relates to a kind of by claim 1 led module as described in the preamble (LED, light-emitting diode).
For example from IEICE Trans.Electron., volume E80-C, the second phase, in February, 1997, in led module is disclosed.A kind of led module with silicon substrate wherein has been described, this silicon substrate presents the groove of many etchings, has arranged a led chip in these grooves respectively.The tiltedly upright wall of groove is used as the reflector of emission beam at this.
The led module that need have microsize and high brightness for many purposes.These modules especially are suitable as the semiconductor light sources that combines with the imaging optical system resemble the projecting apparatus for example.
Can realize the raising of led module brightness in principle as getting off, promptly improve the packaging density of each luminous element, wherein, keep or amplified the power output of optics simultaneously.
Under the microminiaturized situation of progress, problem is the electrical loss heat that leaves and produced in the space that becomes more and more littler.
Task of the present invention is to create a kind of led module with high brightness, and this led module has the high as far as possible packaging density of each LED, and can advantageously be made by cost simultaneously.Task of the present invention in addition is a kind of multiple device of this led module of explanation.
By solving this task by the led module of claim 1 or by the multiple device of claim 30.Dependent claims has illustrated favourable improvement project of the present invention.
Stipulated to lay many LED by the present invention on carrier, wherein, this carrier contains at least one semiconductor layer, and has arranged LED on the flat interarea of carrier.LED should at first be interpreted as led chip in the case, just has the light-emitting diode semiconductor body of contact-making surface.Also can adopt other radiated emission body in addition in the present invention.This generally also comprises phosphor-coated light emitting diode except light-emitting diode, such as laser diode and super-radiator.This radiated emission body is particularly suitable for the form of semiconductor body.
This arranged different structures be used between the environment of LED and led module electricity and heat be connected.Mainly pass the derivation that carrier carries out electrical loss heat.Power supply for LED has preferably constituted independent conductor structure on carrier surface.
Advantageously by arrange LED on the flat interarea of carrier, the extra high packaging density of LED is possible.Very unfertile land is implemented carrier so is possible in addition, has reduced the resistance to heat of carrier by this very thin enforcement, and has made things convenient for shedding of loss heat.
Preferably silicon or GaAs are used as the semi-conducting material of semiconductor layer in the carrier.Also can adopt the material of the ceramic-like of good heat conductive in addition, for example resemble aluminium nitride or boron nitride, or for example resemble the carbide of carborundum.Below with notion " semiconductor " be interpreted as these compounds with and the material of deriving, when making semiconductor, adopt usually.
This material, especially silicon advantageously present the high capacity of heat transmission, and therefore are well suited for the material as the heat conduction carrier.Usually adopt described material in this external semi-conductor industry, and can obtain easily there.The carrier of the above is preferably delimited by electric insulation layer in the side of laying LED.Thereby hindered the parallel connection of LED, make it possible to connect exclusively these LED.Also can constitute a plurality of insulating barriers in addition, between these insulating barriers, arrange the layer of conduction.In this expansion scheme, can advantageously realize the compound connection of each luminous element.
For example can be by the form formation insulating barrier of known method with silicon oxide layer or silicon nitride layer.Preferably described insulating barrier is embodied as two-layerly, wherein, silicon nitride layer is placed on the silicon oxide layer.So unfertile land is implemented this insulating barrier, makes it not influence the capacity of heat transmission of carrier.At this moment, the characteristics of this insulating barrier are high insulativity, and to environmental impact, especially to the big durability of humidity.
In advantageous modification of the present invention, on carrier, constituted each conduction region separated from each other, each LED directly or by the intermediate layer is placed in these districts.The conduction region that has high reflectance in the case is particularly preferred, and these are distinguished by being reflected in the luminous efficiency that the beam component that gives off on the carrier direction improves led module.For example aluminium is particularly suitable for the material that has the conduction region of high reflectance as this.
A preferred expansion scheme of the present invention is to constitute independent chip connector district on conduction region, has guaranteed the durable and reliable fixing of semiconductor body under the situation of the closing of contact that these chip connector districts are good at the same time.The chip connector district is particularly suitable for the form of piling up with thin metal layer, and wherein, each layer preferably contains titanium or resemble gold or the noble metal of platinum.
In a favourable improvement project of the present invention, carrier is placed on the cooling body with the side of LED dorsad, this cooling body preferably constitutes metal level or metal derby.This metal level has the very high capacity of heat transmission, and has therefore improved the heat radiation from led module.Also improve the mechanical stability of led module simultaneously.Therefore can advantageously create one and have the very led module of the compact package of high brightness and efficiently radiates heat.
Copper or aluminium are because their the high capacity of heat transmission especially is suitable as the material of cooling body.Cooling body is that preferred adhesive by scolder or heat conduction is connected with carrier, has guaranteed good heat transition thus equally.
The preferred in the present invention LED of each spontaneous emission different colours light (the following led color that also abbreviates as) at work is installed on the carrier.Therefore utilize the present invention can generate the light of blend color, wherein, additionally from by producing radiative color the light emitted color of each LED.
Can advantageously regulate the color of mixed light by the corresponding different conducting electric current of each LED.
A kind of other possibility that is used for definite blend color is, adopts the LED of same color in a led module with different separately quantity.Two kinds of possibilities can also alternately be used both multiplely, and wherein, the latter has operating current and is distributed to advantage on each LED more equably, and the former is more flexible at work, and realize the accurate adjustment of chromaticity position.
Especially preferably jointly in the present invention, for example adopt emission to have the LED of the light of the centre wavelength in redness, green and the blue coloured light spectral coverage by the quantity that equates.Therefore created a led module that when corresponding conducting electric current, has the emission white light of high brightness.Can launch the light of different colours in addition by the conducting electric current that changes each LED, wherein, cover the major part of color space.Especially can regulate white point (no color dot, chromaticity position x=y=z=0.33) very accurately.Therefore the present invention can be used as the pure white coloured light that white light source is used to generate high strength, non interference cross-color.
This led module is suitable for substitute as incandescent lamp with big advantage, and can for example be used as the white light source in the projecting apparatus.The microsize of led module of the present invention and high brightness are particularly advantageous in the case.
This led module is suitable for specially as the light source in the LCD projecting apparatus.Can implement the LCD projecting apparatus equipped with the present invention very compactly, wherein, described light source is better than having the conventional light source of incandescent silk aspect hot in the loss of life-span, energy consumption and appearance.The present invention is because the purposes that these characteristics and preferably being suitable for move, for example at automotive field.
Other a advantage of the present invention is the adjustable photosensitiveness of led module, promptly changes brightness by changing operating current.Opposite at this with incandescent silk, light emitted main spectrum change does not appear in big brightness range.For example can realize the variation of operating current by pulse-width modulation at this.
In a favourable expansion scheme of the present invention, on carrier, arranged the LED of matrix form.This allows the high packaging density of LED, and has made things convenient for the automated manufacturing led module.
Pattern with the matrix form of rule on this external carrier has arranged to have the LED of same color separately.The layout of rule should be interpreted as the layout that a kind of adjacent arrangement of the repetition by one or more basic patterns produces at this.Installation work amount when having simplified the control of LED and having reduced manufacturing by this layout.
In order to reach uniform blend of colors, LED is being arranged it is favourable with the order that periodically repeats aspect their color in row matrix, wherein, the LED in each row matrix arranges preferably identical or of the same type.
If so come to stack mutually the layout in directed each row matrix in ground, make and in rectangular array, arranged identical color LEDs respectively, then can be easy in series gather the LED of the same color of row separately.
With respect to the layout in the row matrix with odd-numbered line number, will having layout in the row matrix of even number (when serial number) row number, to move a column width to the left or to the right respectively be particularly advantageous.Therefore avoided monochromatic row, suppressed the formation of color illusion and reached color perception especially uniformly.Simultaneously can be easily the LED of same color be aggregated into series circuit by zigzag connection.
From the following explanation of four embodiment, 1 to 4 draw other feature, advantage and reasonability of the present invention in conjunction with the accompanying drawings.
Fig. 1 has showed the constructed profile of first embodiment of led module of the present invention,
Fig. 2 a and Fig. 2 b have showed diagrammatic top view and the signal detailed view of second embodiment of led module of the present invention,
Fig. 3 a-3e has showed five modification of diagrammatic top view of the 3rd embodiment of led module of the present invention,
Fig. 4 has showed the diagrammatic top view of the 4th embodiment of led module of the present invention,
Fig. 5 has showed the constructed profile of first embodiment of the multiple device of led module of the present invention,
Fig. 6 has showed the constructed profile of second embodiment of the multiple device of led module of the present invention, and
Fig. 7 a and 7b have showed diagrammatic top view and the constructed profile of the carrier embodiment of led module of the present invention.
At this element identical or same function is equipped with same reference symbol.
The carrier 2 of led module 1 shown in the accompanying drawing 1 has the structurized silicon substrate 5 by following described led chip device, and this silicon substrate is to be soldered on the cooling body 3 of copper billet shape.Adopt golden tin solder as scolder 4, make the connection of between silicon substrate 5 and copper billet 3, guaranteeing mechanically stable and effective heat transition.Alternatively also can silicon substrate 5 be connected with copper billet 3 by the adhesive of heat conduction.
Silicon substrate 5 forms multilayer.Layer by unadulterated silicon system forms substrate bulk.Lay a two-layer insulating barrier 6 thereon, this insulating barrier 6 is made up of a silicon oxide layer 7 and a silicon nitride layer 8, and wherein, silicon oxide layer 7 boundaries lean against on the substrate bulk.
Can easily make the two-layer insulating barrier 6 of formation like this with the known method of silicon technology, and the characteristics of insulating barrier 6 especially are to prevent moist huge durability of invading except electrical insulation characteristics.
Many metal coverings that are separated from each other 9 are placed on the insulating barrier 6, and chip connector district 10 is formed in again on these metal coverings.Metal covering 9 is preferably made of aluminum.Chip connector district 10 has respectively by piling up that three thin metal levels are formed, and sees that from the side of silicon substrate 5 these metal levels are by titanium, platinum and golden the composition.
Distinguish a bonding LED semiconductor body 11 on the gold surface in chip connector district 10 by electrically-conducting adhesive.Weldering connection between semiconductor body 11 and chip connector district 10 can be possible equally.
For further contact contact, semiconductor body 11 has been equipped with a contact-making surface 12 on the side of carrier 2 dorsad, and connects 13 with wire and be connected to each other.Aluminium face 9 both had been used as the wire connector area, the reflector of the beam that also is used as in the work to be generated, and these wire connector areas are electrically connected with the side towards carrier 2 of the semiconductor body of being installed 11 respectively.
In an illustrated embodiment, the thickness of copper billet 3 is that the thickness of 3.0mm, silicon substrate 5 is 220 μ m, and the thickness of insulating barrier 6 is 0.62 μ m.Constitute aluminium lamination 9 and constitute chip connector district 10 with the thickness of 1.0 μ m with the gross thickness of 0.3 μ m.With the thick semiconductor body of 200 μ m, under the situation in the semiconductor cross section of the size of mesh opening of 600 μ m * 600 μ m and 260 μ m * 260 μ m, amounted to the resistance to heat of the 177K/W that relates to a grid cell.
Under the condition of static state, under the typical electrical loss power situation of the 50mW of each LED, therefore the temperature difference between semiconductor surface and the carrier downside is about 8.9K (irrelevant with the quantity of grid cell).
The layout of in vertical view, having showed the face shape of LED among the accompanying drawing 2a.180 LED 11 have been installed altogether, each 60 LED with the centre wavelength in redness, green and the blue coloured light spectral coverage on carrier.With matrix arrangement described LED, wherein,, arranged red LED 14, green LED 15 and Lan Se LED 16 adjacent to each other with periodic order among the b at each row matrix 17a.
At this moment, at each row matrix 17a, the layout among the b is that so to stack ground each other directed, makes the row matrix 17b with odd-numbered line number have same layout respectively, and therefore in these row matrixs 17b self ground arranged the LED of same color respectively.At this moment, row number should be interpreted as, under the situation of the row matrix of serial number usually, distribute to respectively from the top down each row matrix number.
Have LED among the row matrix 17a of even number line number and arrange layout among the row matrix 17b that is equivalent to have odd-numbered line number, but be moved to the left a column width with respect to row matrix 17b with odd-numbered line number.The row matrix 17b of odd number only in the edge columns of on the left side, and in the edge columns on the right only the row matrix 17a of even number be equipped with LED, make each row matrix contain the LED of same quantity.
By zigzag series circuit, this general arrangement of LED has realized the wiring that is positioned at the LED on the upper-lower position of same color, and has therefore realized the simple control of same color LED.
With respect to the layout of only having arranged the LED of same color in rectangular array, shown layout has following advantage, the line that runs through continuously or the diagonal of same color promptly do not occur.Therefore reach the emission of uniform blend color, and suppressed the appearance of interference illusion.
At the enterprising row wiring of the direction of rectangular array, wherein, except in row matrix in the end, the contact 12 on the semiconductor body 11 of each LED is to connect 13 by wire to be connected with the aluminium face 9 that is positioned at the LED under it diagonally of same color.
First is to be connected with wire on the contact-making surface 18 of outside to be connected with the LED of last row matrix.Give two the LED power supplies in the adjacent column that are arranged in of same color at work respectively by these contact-making surfaces 18.
Because the LED series circuit, so can press to module for power supply, these voltages are equivalent to many times LED supply voltage, and can need not big workload and from the common machine that moves power supply produce these voltage.Owing to can connect the LED row of same color apart from each other, even described module can work on advantageously also when row lost efficacy.
Show aluminium face 9 among the accompanying drawing 2b enlargedly.This face 9 has the base shape at right angle, wherein, has formed the breach 19 at a right angle on an angle, and has placed the district of less area a little 20 that is equivalent to described breach 19 in the angle of relative seamed edge one.
This appearance realizes area coverage and the layout insulated from each other of aluminium face 9.Described area district 20 has formed the wire connector area at this moment, and this wire connector area is used to contact the semiconductor body 11 that is placed in respectively on the aluminium face 9.This wire connector area is separated with chip connector district 10, because when semiconductor body 11 is installed in the chip connector district 10, scolder or adhesive residue may be deposited on the chip connector district around, these remnants make that the contact of reliable wire contact is more difficult.
The face 9 that is arranged among the even number row matrix 17a is equivalent to the shape shown in the accompanying drawing 2b.Face 9 among the odd number row matrix 17b draws from this shape by the mirror image of level.Under the situation of the routing path that is arranged in favourable weak point that replaces of these shapes, realized having the series circuit of being showed of zigzag wiring.
So the led module that forms has the seamed edge length of about 9mm * 10mm, and has reached 77kcd/m for white light 2Brightness.Therefore described led module is a kind of light with scalable color, especially the LED-based white light source with high packaging density and brightness.
Other favourable layout of having showed relevant led color in the accompanying drawing 3.In the embodiment shown in the accompanying drawing 3a, the LED that has been disposed in order periodically to repeat again in row matrix.In rectangular array, arranged the LED of same color respectively.The series circuit of the LED of same color is simple especially in the case.
In the embodiment shown in the accompanying drawing 3b, the same LED that has been disposed in order in row matrix periodically to repeat.At this moment, always second in the self-alignment row matrix thereon gone, and drawn layout in the row matrix by the column width that moves right.Even here by along the LED that can easily gather same color from the upper left side to the diagonal of lower right.
Embodiment shown in the accompanying drawing 3c is equivalent to the layout of being showed among the accompanying drawing 2a.Avoid the line that runs through continuously of same color in the case, made to produce interfering illusion, and therefore formed the especially evenly light source of emission.
Obviously can adopt three identical permutation of two circulations of led color shown in the accompanying drawing 3d.Similarly all row matrixs and corresponding row can be exchanged.
In the layout shown in the accompanying drawing 3e, only equipped the grid position that is positioned within (dotted line) circular contour.It is favourable that this layout combines with the optical system with corresponding circular input aperture, for example as input aperture that cylindrosymmetric optical instrument had.Described input aperture is shone well-illuminatedly by the device of being showed.By on the grid position that is positioned within the input hole footpath, reducing the equipment of LED, advantageously reduced the power input of led module, and do not reduced illuminating of optical system simultaneously.
In this embodiment, be similar to accompanying drawing 3c and arrange LED in view of their color, make the LED that can on the direction of rectangular array, gather same color by zigzag series circuit.In contrast, departed from periodicity layout repeatedly, and improved the quantity of green LED, made and in this module, adopted 34 greens, 19 redness and LED 16 blue looks altogether along row matrix.In this weighting of LED quantity, led module generates white mixed light under the situation of the identical conducting electric current of all LED.
By the applicable cases difference, also can make up each feature of arranging shown in the accompanying drawing 3a-3e.Obviously also can adopt simpler circuit and layout, such as the disorder distribution of led color, or the pure series circuit of all LED.As in accompanying drawing 3e, the color grade of mixed light depends on the frequency of same color LED in the latter case.
The one embodiment of the present of invention under pre-assembled state have been showed in the accompanying drawing 4.Led module 1 is bonding or is soldered to the supercentral of copper base plate 21.The contact joint 18 that is used for LED rectangular array power supply be by conductor frame 22 usefulness beam shapes outwards the printed conductor of distribution guide the plumb joint 23 of the amplification on the bottom edge into, wherein, as get off to separate and enforcement plumb joint 23, make them easily to be connected with the electronic unit of control that is used for led module 1 or power supply.
A casting framework 24 has been installed on conductor frame, and the casting inside of frame is by the resinous thin cast layer filling of the transparent reaction that for example resembles epoxy resin, so that the protection led module with preferably.
Other a embodiment of the present invention has been shown in the accompanying drawing 5.Be different from the embodiment shown in the accompanying drawing 1, a plurality of led modules 1 here have been installed on a common cooling body 3, the feasible multiple device that has formed led module 1.
The structure of each led module 1 is equivalent to the led module 1 showed in the accompanying drawing 1 basically, and this structure comprises a carrier 2 with semiconductor layer 5 and multilayer dielectric layer 6, be formed in metal covering with chip connector district 10 9 on the described carrier and LED semiconductor body 11 fixed thereon.
At this moment, LED quantity on each led module and exclusive demand can be complementary.For example each led module can contain a red LED, two green LED and a blue look LED, just four LED altogether.Under the situation of the operating current of correspondingly coordinating LED, each led module itself forms a white light source.Self-evident, led module also is suitable as color light source, is particularly suitable for the light of blend color, and wherein, led module advantageously has high packaging density in all cases, and almost is point-like therefore.
Arranged that between led module 1 printed conductor 24 is used for the power supply of each led module.Connecting 13 by wire sends into operating current among each LED.Can control independently of one another and each led module of switch by this direct power supply, and further control and each LED of switch.If do not wish independently to control, this does not get rid of series connection and/or the parallel circuits of each module or LED certainly.
Preferably on suitable printed conductor carrier 25, such as constitute described printed conductor 24 on the printed circuit board.Preferred for this reason printed circuit board or the corresponding printed circuit board film that adopts flexibility, such as flexible board.
Preferably 1 liang of peacekeeping of each led module is arranged on the cooling body rectangularly.Therefore can for example on a common cooling body, gather 32 led modules with each four led chip.Printed conductor carrier 25 with printed conductor 24 of laying thereon reasonably constitutes the shape of grid at this, wherein, has arranged led module 1 in grate opening.
Other a embodiment of the present invention has been shown in the accompanying drawing 6.In the embodiment that in accompanying drawing 5, is showed, a plurality of led modules 1 have been installed on a cooling body 3, these led modules 1 have the printed conductor 24 that is arranged in therebetween.In described led module 1, only show carrier 2 and LED 11 respectively.At length can adopt the structure resembling in illustrated so far led module.Different with the embodiment that is showed in the accompanying drawing 5, a reflector 26 is installed on this device, this reflector 26 for example can be seated on the side of cooling body dorsad 3 of printed conductor carrier 25.
Described reflector has a plurality of breaches 27, and the side 28 of these breaches to small part tilts, and is used as reflective surface.Reflector has a kind of printed conductor carrier 25 that is equivalent to, for example grid-like shape in vertical view.Advantageously improved the luminous efficiency of led module by described reflector.
The vertical view of the carrier 2 that led module with four LED uses has been shown among the accompanying drawing 7a.For example can adopt this led module among the embodiment that in accompanying drawing 5 and 6, is showed.Accompanying drawing 7b shows the affiliated view of the section of A-A along the line.For clarity, especially not to scale (NTS) show bed thickness.
As what illustrated, described carrier comprises a semiconductor layer 5 that preferably contains silicon or GaAs, and an insulating barrier 6, and this insulating barrier can have a silicon oxide layer 7 and a silicon nitride layer 8 again.
On insulating barrier 6, arranged four separate and electric insulation such as metal covering 9a aluminum, 9b, 9c and 9d inlay these metal coverings by the structure 29 of frame shape.As what illustrated, on described metal covering, can be configured for installing the chip connector district (not shown) of LED.
The structure 29 of frame shape is protruding, and for example with until 30 μ m, especially the thickness between 5 μ m and 25 μ m constitutes, and is used as the receptacle that adhesive is used, and these adhesives are as the silver-colored electroconductive binder that is used to install LED.At this moment, the structure 29 of frame shape forms the container of a flute profile around each metal covering or each chip connector district, and this container prevents that unnecessary adhesive from overflowing to the adjacent metal face, and prevents from therefore to form short circuit between each LED.
For example can be by plastics, preferred polyimides is made the structure of this frame shape, and its method is to lay and the corresponding plastic layer of structuring by semiconductor technology technology.
The structure 29 of described frame shape is that the angle with carrier separates far away, and constitutes towards carrier center 31 directions withdrawal ground, makes to go out to send from carrier center 31, metal level 9a outside the structure 29 of frame shape, 9b, the part district 30a of 9c and 9d, 30b, 30c and 30d are unlapped.These part districts 30a, 30b, 30c and 30d are used as the joint location that outside wire is connected usefulness, and these wires connect such as lead to the printed conductor of being showed in accompanying drawing 5 and 6, and wherein, each part district is connected conductively with affiliated metal covering.
The present invention obviously should not be construed as restriction of the present invention by the elaboration of described embodiment.

Claims (39)

1. have a plurality of LED semiconductor bodies (11) and a led module (1) that has the carrier (2) of first and second interareas, wherein, described carrier (2) has at least one semiconductor layer (5), it is characterized in that, described first interarea of carrier (2) is that the plane constitutes, and described LED semiconductor body (11) is to be placed on described first interarea of carrier (2).
2. by the led module (1) of claim 1, it is characterized in that described at least one semiconductor layer (5) contains silicon or GaAs.
3. by the led module (1) of claim 1 or 2, it is characterized in that described carrier (2) is that multilayer constitutes.
4. by the led module (1) of one of claim 1 to 3, it is characterized in that the carrier (2) on the described first interarea side is delimited by at least one electric insulation layer (6).
5. by the led module (1) of claim 4, it is characterized in that described at least one insulating barrier (6) is that multilayer constitutes.
6. by the led module (1) of claim 4 or 5, it is characterized in that described at least one insulating barrier (6) contains silica or silicon nitride.
7. by the led module (1) of one of claim 1 to 6, it is characterized in that, constituted conduction region (9) on described first interarea of carrier (2), described LED semiconductor body (11) is placed in these districts.
8. by the led module (1) of claim 7, it is characterized in that described conduction region (9) has high reflecting power in the spectrum segment of being launched beam by described LED semiconductor body (11).
9. by the led module (1) of claim 7 or 8, it is characterized in that described conduction region (9) contains aluminium.
10. by the led module (1) of one of claim 4 to 6, it is characterized in that, on described insulating barrier (6), formed chip connector district (10), and described LED semiconductor body (11) is placed in the described chip connector district (10).
11. the led module (1) by one of claim 7 to 9 is characterized in that, formed chip connector district (10) on described conduction region (9), and described LED semiconductor body (11) is placed in the described chip connector district (10).
12. the led module (1) by claim 10 or 11 is characterized in that described chip connector district (10) has a thin metal layer respectively and piles up.
13. the led module (1) by claim 12 is characterized in that described metal level contains titanium, copper or noble metal, especially gold or platinum.
14. the led module (1) by one of claim 1 to 13 is characterized in that the carrier on the side of described second interarea (2) is connected with a cooling body (3).
15. the led module (1) by claim 14 is characterized in that described cooling body (3) contains copper or aluminium.
16. the led module (1) by claim 14 or 15 is characterized in that described cooling body (3) is contiguous on the described semiconductor layer (5).
17. the led module (1) by claim 16 is characterized in that described cooling body (3) is connected with described semiconductor layer (5) by the adhesive of a kind of scolder (4) or a kind of heat conduction.
18. the led module (1) by one of claim 1 to 17 is characterized in that, goes up by the described LED semiconductor body of matrix arrangement (11) at described carrier (2).
19. the led module (1) by one of claim 1 to 18 is characterized in that, the light of the different centre wavelengths of described at work LED semiconductor body (11) emission.
20. the led module (1) by claim 19 is characterized in that the described light of being launched at work by each LED semiconductor body (11) has the centre wavelength in redness, green or the blue coloured light spectral coverage.
21. the led module (1) by claim 19 or 20 is characterized in that, has arranged the described LED semiconductor body (11) of identical central wavelength separately that has on described carrier (2) regularly.
22. by the led module (1) of claim 21, it is characterized in that, with described LED semiconductor body (11) according to its centre wavelength with periodically repeat be arranged sequentially in described row matrix (17a, b) in.
23., it is characterized in that (17a has the order that same periodicity repeats according to described centre wavelength in b) to the described row matrix that is arranged in of described LED semiconductor body (11) by claim 21 or 22 led module (1).
24. the led module (1) by claim 23 is characterized in that, has arranged the LED semiconductor body (11) with same centre wavelength in described rectangular array respectively.
25. led module (1) by claim 23, it is characterized in that, layout with the described LED semiconductor body (11) in the described row matrix (17b) of odd-numbered line number is identical, and draws layout in the described row matrix (17a) with even number line number by moving a column width to the left or to the right from the described row matrix (17b) thereon of position.
26. the led module (1) by one of claim 1 to 25 is characterized in that, by a kind of adhesive welding or bonding described LED semiconductor body (11).
27. the led module (1) by claim 26 is characterized in that described adhesive conducts electricity.
28. the led module (1) by claim 26 or 27 is characterized in that described adhesive is a kind of scolder or a kind of adhesive, especially a kind of silver-colored electroconductive binder.
29. the led module (1) by one of claim 26 to 28 is characterized in that, has constituted the container that described adhesive is used around described LED semiconductor body at least in part.
30. have a plurality of multiple devices by the described led module of one of claim 1 to 29 (1), it is characterized in that, described led module (1) is to be placed on the common cooling body (3), wherein, the described carrier (2) of the led module on the side of described second interarea (1) is connected with described cooling body (3) respectively.
31. the multiple device by claim 30 is characterized in that described cooling body (3) contains copper or aluminium.
32. the multiple device by claim 30 or 31 is characterized in that the semiconductor layer (5) of described led module (1) is contiguous to respectively on the described cooling body (3).
33., it is characterized in that the semiconductor layer (5) of described led module (1) is that the adhesive by a kind of scolder (4) or a kind of heat conduction is connected with described cooling body (3) by the multiple device of claim 32.
34. the multiple device by one of claim 30 to 33 is characterized in that, has arranged printed conductor between described led module.
35. the multiple device by claim 34 is characterized in that described printed conductor is formed on the printed conductor carrier, this printed conductor carrier is seated on the described cooling body.
36. the multiple device by claim 35 is characterized in that described printed conductor carrier is the printed circuit board of a printed circuit board, a flexibility, a printed circuit board film or a flexible board.
37. adopt the led module (1) of one of claim 1 to 29, or the multiple device of one of claim 30 to 36 is used to generate the purposes of white light mixed light, it is characterized in that, determine the chromaticity position of described mixed light by the operating current of described LED semiconductor body (11).
38. the purposes by claim 26 is characterized in that having the LED semiconductor body (11) of identical central wavelength with described identical operating current supply.
39. adopt the led module (1) of one of claim 19 to 29, or the multiple device of one of claim 30 to 36 is used to generate the purposes of white light mixed light, it is characterized in that, so select to have the frequency of the described LED semiconductor body (11) of identical central wavelength, make under the situation of the identical conducting electric current of all LED semiconductor bodies (11), to generate the white light mixed light.
CNB018174647A 2000-10-16 2001-10-09 LED module Expired - Lifetime CN100431161C (en)

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US20090052178A1 (en) 2009-02-26
CN100431161C (en) 2008-11-05

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